At first it's really tedious, but once you start to get the hang of it, it's not that bad. When you're posting, there is a series of controls at the top of the box. the sigma will bring up a clickable interface so you can choose different symbols, and the subscript and superscript symbols are pretty useful too. once you get the hang of using it, it's pretty easy to just type in the code as you go along. just don't forget to close your tags, otherwise the output won't look right. : )